Dean Ornish, M.D., is the founder and president of the non-profit Preventive Medicine Research Institute and Clinical Professor of Medicine at the University of California, San Francisco. For over 34 years, he has directed clinical research demonstrating that comprehensive lifestyle changes may begin to reverse severe coronary heart disease, without drugs or surgery. He was appointed by President Clinton to the White House Commission on Complementary and Alternative Medicine Policy and by President Obama to the Advisory Group on Prevention, Health Promotion, and Integrative and Public Health. He was selected as one of the "TIME 100" in integrative medicine and by Forbes as "one of the seven most powerful teachers in the world." He received his medical training from the Baylor College of Medicine, Harvard Medical School, and the Massachusetts General Hospital. He earned a B.A. in Humanities summa cum laude from the University of Texas in Austin.